It may also be that when Gmail displays the mail on the website it's
changed in some way, altered formatting, adding a tagline or similar. If
this happens, the message that the extension sees on the website will
not be the same as the original, and any digital signature will be
invalidated. Remember the extension is downloading the mail as displayed
on the website, this may not be the same as the original mail received
from the sender. As you say even a minor formatting change, e.g. line
wrapping to fit the web page could be enough to cause the signature to
fail. If the message has already been altered to display on the web
page, then there's nothing the extension can do to prevent the signature
failing.
Gil wrote:
The sender was using Thunderbird, sending mail through their ISP's
SMTP server. Hotmail was not involved.
When I got home, I downloaded the message using Thunderbird and
GMail's POP server. The digital signature is just fine when I
download it that way.
Thunderbird reports the signature as invalid only if I download the
message using the Webmail extension. It may be that the extension is
modifying the message in some trivial way (e.g., deleting a trailing
space) that renders the signature invalid.
On Jan 6, 3:00 pm, KE4AVB <[email protected]> wrote:
Gil,
Your sender would not happen be use of the free Hotmail service would
they? I have had problems sending signed and/or encrypted messages
through their service. They are opening and adding Hotmail taglines to
the messages sent thought their service thus invaliding the signatures
and encryptions. The same problem could be happening to other service
providers depending how they operate. The Hotmail problem occurs if I
use the online webmail or not.
Eugene
On Jan 6, 3:45 pm, Gil <[email protected]> wrote:
Should the Webmail extension (with GMail - actually GAFYD) play nice
with S/MIME and digital signatures?
I have received some signed emails using the Webmail extension, and
Thunderbird is telling me that the signature is not valid (message has
been modified).
Other recipients of the same message report no problem with the
signature - they do not use the Webmail extension but just basic POP.
I can't try the same, as I am behind a corporate firewall and cannot
use POP.
It does seems that I am able to receive some emails via the Webmail
extension with valid signatures. Only one sender seems to be affected
so far. It may be that senders using plaintext for their messages are
not affected, but those who compose using HTML may have their messages
corrupted (by the Webmail extension?).
I am using:
- TB 2.0.0.23
- WebMail 1.3.5
- WebMail - GMail 0.6.5b1
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